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Thread: ACPI issues

  1. #1
    Maximum Bitrate Dave One's Avatar
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    ACPI issues

    I am having start up issues with my mobo. I am using an Amptron BKMVP4 Book PC with a CarNetix P1280 connected directly to mobo as it only requires 12v, 5v and ground. ACPI is required to switch the Car PC on and off.
    When XP is installed it assigns Standard PC automatically instead of Advanced Configuration and Power Interface (ACPI) PC, presumably because the mobo is old and XP doesn't recognise whether it is ACPI compatiable. Advanced Configuration and Power Interface (ACPI) PC can be forced with F5 at the XP install. The Car PC can now shutdown but starts with the suspend LED on and will not boot up.
    The only two methods to start the PC involve a reset button press on the boot installed Car PC or a disconnect and reconnect of the P1280 input.
    Is this likely to be an XP ACPI issue or a shutdown issue? Can ACPI be implemented in 98SE or XP in any other way? Is there a program to monitor button presses that could be used to shut the PC down? Would the shutdown time require extending to 90 seconds from 30 seconds (does take 30 seconds to shutdown with ac ATX PSU)? Any other work arounds that may solve the problems?
    Vauxhall Astra SXi Car PC installed.

  2. #2
    FLAC
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    Dave,

    If a reset button press will boot the PC, the the P1280 ACPI should work also. Have we discussed whether you may need an isolation relay on the
    ACPI?
    MikeH

  3. #3
    Maximum Bitrate Dave One's Avatar
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    We have not discusssed the need for an isolation relay on the ACPI or how to implement it or the benefits of it?
    Vauxhall Astra SXi Car PC installed.

  4. #4
    Maximum Bitrate Dave One's Avatar
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    Mike, how would you use the isolation relay? It's only a minor fault but really annoying. You're help is appreciated.
    Vauxhall Astra SXi Car PC installed.

  5. #5
    FLAC
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    Dave,

    Sorry for the late reply...been out of town.

    Some motherboards require an ACPI signal that is NOT referenced to ground. The P1280 ACPI signal IS referenced to ground (ie a short to ground). If your mobo requires a non-grounded ACPI signal you will need an external relay to isolate the P1280 ACPI output. HERE is a diagram of a way to achieve this.

    If your mobo ACPI signal IS referenced to ground, one side of your power button will be "ground". You can measure this with an ohmmeter from the swithc contact to chassis ground (zero ohms=ground). If you can touch the other side of the power switch to chassis ground (try this with caution!) and your mobo successfully boots up, then the P1280 ACPI should work. If the mobo does not boot up, you will need the isolation relay.
    MikeH

  6. #6
    Constant Bitrate techeros's Avatar
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    Dave,
    as soon as I saw you had an Amptron, I was thinking thats the problem without even reading your post... they are horrible mobo's.... new mobo's from them came defected out of the box 80% of the time it seemed. I know I am not much help, and maybe they have changed quality, but maybe another mobo is in order. Good luck
    03' Toyota Tundra T3 Special Edition - Polk Audio speakers - Sony 4ch amp - RF Sub amp
    Carputer Planning |---------*|
    Overall Implementation |---------*-|
    (Stereo complete)
    Computer installed and working

  7. #7
    Maximum Bitrate Dave One's Avatar
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    Some motherboards require an ACPI signal that is NOT referenced to ground.
    I'm sure the power button is ground switched. The Car PC can shutdown, as advertised with ACPI but starts (the next power on) with the suspend LED on and will not boot up. The only two methods to start the PC involve a reset button press on the boot installed Car PC or a disconnect and reconnect of the P1280 input.
    This is an annoying process of opening the boot to undertake the above resolutions. I don't understand why it will not start up properly. When the power button is pressed on the PC whilst using the ac ATX PSU it will shutdown and start as it should. The ac ATX PSU has a PS on# wire from the mobo that is not connected with the P1280. Presumable this wire provides a 'handshake' with the ac ATX PSU to identify that power is no longer needed to complete the shutdown.
    I wonder without this connection to the mobo registers an improper shutdown. Maybe the reset or power disconnect clears this register? Any thoughts, experienced or knowledge of this situation?
    Vauxhall Astra SXi Car PC installed.

  8. #8
    Maximum Bitrate Dave One's Avatar
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    techeros,
    What booksize PC with 400MHz and OS did you use? Did you have any ACPI probs if similar mobo?
    Dave
    Vauxhall Astra SXi Car PC installed.

  9. #9
    Constant Bitrate techeros's Avatar
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    I used win98se on the book pc I have for sale. Um ACPI.. no problems that I can remember. I just tooled around in the bios and turned all the power options to disable or off where applicable. Then in the OS, I disabled all the power options so everything was always on.
    03' Toyota Tundra T3 Special Edition - Polk Audio speakers - Sony 4ch amp - RF Sub amp
    Carputer Planning |---------*|
    Overall Implementation |---------*-|
    (Stereo complete)
    Computer installed and working

  10. #10
    Maximum Bitrate Dave One's Avatar
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    How did you switch the your PC off. Power button, remote function or startup/ shutdown controller?
    Your experience is appreciated
    Vauxhall Astra SXi Car PC installed.

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